Variable stroke pump



G. A; FRENKEL 2,235,631 'VARIABLE STROKE PUMP Filed sept. 1s, l19:59 z shams-sheet 1 Mm 18, 1941. Q A FRENKEL 2,235,563l

VARIABLE STROKE PUMP Filed Sept. 13, 1939 y 2 Sheets-Sheet 2 lnvenior" usTav A. Frenke\ Patented Mar. 18, 1941 I y A l l I UNITED STATESl PATENT oFFlcE VARIABLE STROKE .PUMP

Gustav Adolf Frenkel, Oakland, Calif., assignorto Shell Development Company, San Francisco, Calif., a corporation of Delaware Application September 13, 1939, Serial No.294,604 4 Claims. (Cl..103-38) The present invention relates to pumping de- With a spur gear 32 keyed on a crankshaft 33 p vices of the proportioning type. More particularvwhich is also mounted on bed 2. Also mounted on ly the invention relates to proportioning pumps crankshaft 33 is a flywheel 34. A connecting rod wherein the rate of delivery is varied according to 35 driven by crankshaft 33 is pivotally attached variations in the length of stroke of a reciprocatat one end to the lower end of forkedyoke I9.

ing piston pump. In Figure 5, the handwheel has been replaced One of the objects ofthe present invention is by a pulley wheel 35. A second'pulley wheel 36 to provide a simple, advantageous and practical is mounted on a panel 3l and is rotated by a construction of a proportioning device of the class handwheel 33 on the opposite side of thegpanel. l0 specified. A pair of pulley wheels 39 and 40 are also mountl0 Another object is tov provide an improved ed on panel 31. By means of a belt drive4I means of adjusting the delivery rate of the pump. pulley wheel 35 may be rotated by turning hand- A further object 'is to provide adjustment Wheel 33. A means particularly adapted to remote control. The operation of the mechanism is as follows: Still further, it is an object of this invention Areciprocating action is delivered to the piston l5 to provide improved -means whereby the rate of rod 24 by the rocking arm effect' of the pivoted delivery of the pump may be easily varied duryoke I9 acting through slideshoe 20 and crosshead ing operation. 2l.v Since toggle levers I3 and I4 are mounted Other objects of the invention will appear and on the frame 3 at I5' and I3 and on the rocking be pointed out hereinafter. yoke I9 at I1 and I3 these last two points will act 20 In the accompanying drawings: as fulcrum points. Therefore, as the stationary Figure 1 is a plan view of the unit. I handwheel I8 is turned and cross-piece I0 raised Figure 2 is a side elevationA of the unit. or lowered, indirectly raising and lowering toggle Figure 3 is a side elevation taken along the line levers I3 and I4, the extent of the rocking motion 5 3-3 of Figure 1. of slideshoe 20, and accordingly the degree of re- 25 Figure 4 is an end elevation taken along the 'ciprocation transmitted to crosshead 2l attached line 4-4 of Figure 2. to piston rod 24 will be varied.

Figure 5 is a fragmentary view of the top of When the toggle levers I3 and I4 are lowered so the unit showing one method'of adapting the as to be in alignment with piston rod 24, the ful- .30 adjusting Wheel to remote control. crum point of the rocking yoke I9 will also be 30 g In Figures 41, 2, 3 and 4, a support bracket I is in the horizontal plane of the piston rod and mounted on a bed 2. "Formed as an integral part there will be no reciprocating motion transmitted. of the bed 2 is a support 3 on which is removably As the toggles levers are raised, the length of mounted a.v platform support 4 and a pump cylinstroke ofthe piston' rod will gradually increasev der 5. A spindle 6, threaded at the upper end to its allowable maximum. 35 to receive bearing ring 1, hand wheel 3 and lock Numerous advantages are to, be found in the nut 9, is slidably mounted in the top of support present -design over existing mechanisms of the bracket I and supports an upper cross-piece' I0. general type. as 101 eXample, the adjustment Two links II and I2 are pivotally attached to the wheel is stationary at all times, thus making for ill upper cross-piece I0 at their yupper ends A pair more eminent, aCCllIae and'simple COlltlOl 0f de- 40 of toggle levers I3 and I4 pivotally mounted'at livery rates. This feature is also particularly deone end on support3 at I5 and I6 .t1f1e other end sirable for remote control purposes as various being pivotally attached to and supported by the types 0f Such devices may be installed With little lower ends of links Il and I2 at, l1 and la, o'r no modiflcation of the unit and without the if Also pivotally attached and supported at I1 and necessity of the complicated arrangements re- 45 I3 is a forked yoke I9 straddling a platform supquired when the adjustment means mOi/9S during port 4. A slideshoe 20 slidably mounted in yoke the operation of the pump.

I9 is pivotally attached to a crosshead 2| by means Another advantage is the arrangement of the of wrist-pin 22, crosshead 2| being in itself slidpump and pistonrod whereby, due to the mountably mounted on platform support 4 at 23. Piston ing of crosshead 2I in the platform support 4 at 50 rod 24 leading through packing nut 25 and pack- 23, the piston rod is always maintained in positive ing gland 26 to piston 21 is attached to crosshead alignment and any possibility of lateral stresses 2I at. 28. avoided. Further, the horizontal pump axis pro- A drive shaft 29 mounted onbed 2 is provided vided enables the ready removal of gas pockets so with a :dog clutch 30 and driving gear 3| meshing from the pump when pumping liquids.

Still another advantage is the fact that the pump proper is detachably mounted to the drive unit. This enables the use of various types of reciprocating pump elements, as for example double acting, single acting, diaphragm, etc., with-v .of said piston rod being rigidly attached to said crosshead, a support rigidly mounted on said Trame, a slideshoe pivotally attached to said crosshead, a yoke slidably mounted on said slideshoe, a pair of toggle levers pivotally mounted at one end on said frame in the same horizontal plane as the axis of said piston cylinder,A the other ends of said toggle levers being pivotally attached to said yoke, a cross-piece above said yoke, means for forming a pivotal connection between said yoke and said cross-piece, a threaded spindle rigidly attached to said crosspiece, extending upwards and through said previously mentioned support, being slidably mounted therein, a wheel threaded on the upper end of said spindle whereby vertical adjustment of said cross-piece will be attained by rotation of said wheel, a crank arm pivotally connected to the lower end of said yoke'and means for operat ing said crank arm.

2. Apparatus according to claim l including a second wheel positioned remotely from said apparatus and interconnecting means whereby rotation of said secondwheel will cause rotation of said rst wheel.'

3. A variable stroke proportioning pump 'unit of the class described comprising a frame, a piston cylinder and reciprocable piston, a piston rod for reciprocating said piston, a crosshead slidably mounted on said frame, one end of said piston rod being rigidly attached to said crosshead, a support rigidlymounted on said frame, a slideshoe pivotally attached to said crosshead, a yoke slidably mounted on said slideshoe, a pair of toggle levers pivotally mounted at one end of said frame in the same horizontal plane as the axis of said piston cylinder, the other ends of said toggle levers being pivotally attached to said yoke, a cross-piece above said yoke, means for forming a pivotal connection between said yoke and said cross-piece, spindle means supporting said cross-piece and supported by said previously mentioned support, means for adjusting the vertical disposition 'of said spindle means whereby vertical adjustment of said cross-piece will be coactively attained, a crank arm pivotally connected to the lower end of said yoke and means for operating said crank arm.

4. Mechanism suitable for adjustment of the degree of reciprocation of a reciprocating element comprising a frame, a crosshead slidably mounted on said frame, one end of said reciprocating element being .rigidly attached to said crosshead, a support rigidly mounted on said frame, a slideshoe pivotally attached to said crosshead, a yoke slidably mounted on said slideshoe, a pair of toggle levers pivotally mounted at one end on said frame in the same horizontal plane as the longitudinal axis of said reciprocating element, the other ends of said toggle levers being pivotally attached to said yoke` a cross-piece above said yoke, means for forming a pivotal connection between said yoke and said cross-piece, a vertically disposed element supporting said cross-piece and supported by said previously mentioned support, means adapted for adjusting the vertical disposition of said vertically disposed element whereby vertical dispositional adjustment of said cross-piece will be coactively attained, a crank arm pivotally connected to the lower end of said yoke and. means for operating said crank arm:

' GUSTAY ADOLF FRENKEL. 

